C :

#include <stdio.h>  
#include <stdlib.h>
struct student  
{  
    int num;  
    int score;  
};
int main()  
{  
    struct student students[200];  
    int n,i,j;  
    struct student t;
	while(scanf("%d",&n)!=EOF)  
    {
		for(i=0;i<n;i++)  
        {  
            scanf("%d %d",&students[i].num,&students[i].score);  
        }  
        for(i=0;i<n-1;i++)  
        {  
            for(j=0;j<n-i-1;j++)  
            {  
                if(students[j].score>students[j + 1].score)  
                {  
                    t=students[j];  
                    students[j]=students[j+1];  
                    students[j+1]=t;  
                }
				else if(students[j].score==students[j+1].score)
				{  
                    if(students[j].num>students[j+1].num)  
                    {  
                        t=students[j];  
                        students[j]=students[j+1];  
                        students[j+1]=t;  
                    }  
                }  
            }  
        }
        for(i=0;i<n;i++)  
        {  
            printf("%d %d\n",students[i].num,students[i].score);  
        }  
    }  
      
    return 0;  
}  

C++ :

#include <stdio.h>
#include <stdlib.h>

struct student
{
	int number;
	int score;
};

int main()
{
	struct student students[101];
	int n, i, j;
	struct student temp;

	while(scanf("%d",&n) != EOF)
	{
		//接收数据
		for(i = 0; i < n; i++)
		{
			scanf("%d%d",&students[i].number,&students[i].score);
		}

		//冒泡排序
		for(i = 0; i < n - 1; i ++)
		{
			for(j = 0; j < n - i - 1; j ++)
			{
				if(students[j].score > students[j + 1].score)
				{
					temp = students[j];
					students[j] = students[j + 1];
					students[j + 1] = temp;
				}else if(students[j].score == students[j + 1].score)
				{
					if(students[j].number > students[j + 1].number)
					{
						temp = students[j];
						students[j] = students[j + 1];
						students[j + 1] = temp;
					}
				}
			}
		}

		//输出排序结果
		for(i = 0; i < n; i ++)
		{
			printf("%d %d\n",students[i].number,students[i].score);
		}
	}
	
	return 0;
}

Java :

import java.util.Arrays;
import java.util.Scanner;

public class Main{
   private static Scanner s = new Scanner(System.in) ;
   
   public static void main(String[] args) {
	  while(s.hasNext()){
		  int t = s.nextInt() ;
		  A a[] = new A[t] ;
		  for (int i = 0; i < t; i++) {
			int num = s.nextInt() ;
			int score = s.nextInt() ;
			a[i] =  new A(num, score) ;
			
		  }
		  
		  Arrays.sort(a) ;
		  
		  for (int i = 0; i < a.length; i++) {
			 System.out.println(a[i].num+" "+a[i].score);
		  }
	  }
   }
}

class A implements Comparable{
	int num ;
	int score ;
	
	public A(int num, int score) {
		super();
		this.num = num;
		this.score = score;
	}

	@Override
	public int compareTo(Object o) {
        A a = (A) o; 
        if(this.score<a.score){
        	return -1 ;
        }else if(this.score==a.score)
		    return 0;
        else return 1 ;
	}
	
	
}